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    <title>Document</title>
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    <!-- 三除数 -->
    <script>
      var isThree = function (n) {
        let count = 0
        for (let i = 1; i <= n; i++) {
          if (!(n % i)) {
            count++
          }
        }
        return count === 3 ? true : false
      }
      console.log(isThree(4))
    </script>
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